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HV310 Datasheet(PDF) 6 Page - Supertex, Inc

Part # HV310
Description  Hotswap, Inrush Current Limiter Controllers (Negative Supply Rail)
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Manufacturer  SUTEX [Supertex, Inc]
Direct Link  http://www.supertex.com
Logo SUTEX - Supertex, Inc

HV310 Datasheet(HTML) 6 Page - Supertex, Inc

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6
HV310
1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com
From the second equation for an over voltage set point of
65V, the value of R3 may be calculated.
OV
OFF = 1.26 = 65 • R3 / 500kΩ
R3 = (1.26 • 500K) / 65 = 9.69 kΩ
The closest 1% value is 9.76kΩ.
From the first equation for an under voltage set point of 35V,
the value R2 can be calculated.
UV
OFF = 1.16 = 35 • (R2 + R3) / 500K
R2 = (1.16 • 500K) / 35 – 9.76kΩ = 6.81kΩ.
The closest 1% value is 6.81kΩ.
Then R1 = 500K – (R2 + R3) = 483kΩ
The closest 1% value is 487kΩ.
Undervoltage/Overvoltage Operation
Current Limit
The current limit magnitude above which the current will
not be allowed to rise during startup is programmed using a
sense resistor connected from the SENSE pin to VEE pin.
For example to program a current limit of 1.0A, one would
choose a resistor as follows:
R
SENSE = 50mV / ISENSE
R
SENSE = 50mV / 1.0A
R
SENSE = 50mΩ
GND
VIN
Pass
Transistor
OFF
ON
UVOFF
UVON
OVOFF
OVON
Pin #
Function Description
1
PWRGD
Ths pin is held in Hi-Z state on initial power application and pulls low when the external MOSFET
is fully turned on. This pin may be used as an enable control when connected directly to a PWM
power module.
2
OV
This pin, when raised above its high threshold, will immediately cause the GATE pin to be pulled
low. The GATE pin will remain low until the voltage on this pin falls below the low threshold limit,
initiating a new start-up cycle.
3
UV
This Under Voltage sense pin, when below its low threshold limit will ensure that the GATE pin
is low. The GATE pin will remain low until the voltage on this pin rises above the high threshold,
initializing a new start-up cycle.
4
VEE
This pin is the negative voltage power supply input to the circuit.
5
VDD
This pin is the positive voltage power supply input to the circuit.
6
RAMP
This pin provides a current output so that a timing ramp voltage is generated when a capacitor is
connected. The initial portion of the ramp provides a time delay, which in conjunction with the Un-
der Voltage detection circuit eliminates circuit card insertion contact bounce. The RAMP pin also
controls the delay between the current limit mode disengaging and the PWRGD signal activating;
as well as the current rise profile after the initial turn on delay.
7
GATE
This is the GATE driver output for the external N-Channel MOSFET.
8
SENSE
The current sense resistor connected from this pin to VEE pin programs the current limit. Constant
current output mode is established when the voltage drop across this resistor reaches 50mV.
Pin Description


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